GPIO. Download and Install Driverlib first. Lab 3a: 1. #10: Use the Driverlib command to stop the Watchdog. 2. #16: Show a screenshot of the Register Window showing P1OUT and PIDIR after the pin has been set HIGH 3. #18: Please call me over to observe the LED turning on and off. 4 Attach commented code. Lab 3b: 5. #11: Please call me over to observe the LED turning on with S2 button press. 6. Attached commented code. Questions: 1. Lab 3a: Find the function"_delay_cycles" in your project inside "Includes/C:/ti/ccs910/tools/compil er..." in "intrinsics. h" and write out the exact function declaration line. Hint: it starts with "void." 2. How many bits are in one Port? 3. What does the PXDIR register do? Be specific. 4. Let's say we want to set Port 2, Pin 3 to an output. How would you accomplish this using the register P2DIR using a Hexadecimal command? How would you accomplish this using a Driverlib command? 5. What are Pull-Up/Pull-Down Resistors? What are they used for? Why is this important? Be specific 6. Draw a circuit schematic of how P1.1 is connected with the proper resistor (Pull-Up or Pull- Down) and how the button S2 is connected. Make sure to show where the microcontroller is in the circuit. (Hint: the answer is not in the MSP430 Design Tutorial, you will need to do some research) 7. How many ports does the MSP430F5529 have? How many bits does each port have? 8. What pins correspond to LED1, LED2, S1, S2? 9. In general, why are the Driverlib commands easier to use compared to setting P2DIR to a Hex number? 10. What is the technique used to read a pushbutton in this lab? (Not the name of the function in the code) Why is it called this? 11. What is the difference between a Global variable and a Local variable? 12. For Lab 3b, Is Pin P1.1 normally HIGH or LOW? How can you tell? What happens to P1.1 when you push the button? 13. This lab is called GPIO, General Purpose Input Output. For lab 3, what is the input and what is the output? Be specific.

Idon’t have classes like this sorry

Infrared sensor is most used sensor in wireless technology where remote controlling functions and detection of surrounding objects/ obstacles are involved. this post will discuss about what is infrared sensor, its working principle, how it works, types, applications, advantages and disadvantages. what is infrared sensor

ir sensor is a simple electronic device which emits and detects ir radiation in order to find out certain objects/obstacles in its range. some of its features are heat and motion sensing.

ir sensors use infrared radiation of wavelength between 0.75 to 1000µm which falls between visible and microwave regions of electromagnetic spectrum. ir region is not visible to human eyes. infrared spectrum is categorized into three regions based on its wavelength i.e. near infrared, mid infrared, far infrared.

wavelength regions of infrared spectrum

near ir – 0.75µm to 3 µm
mid ir – 3 µm to 6 µm
far ir – > 6 µm
1 introduction to infrared sensor

fig. 1 – introduction to infrared sensor

working principle of infrared sensor

infrared sensors works on three fundamental physics laws:

planck’s radiation law: any object whose temperature is not equal to absolute zero (0 kelvin) emits radiation.
stephan boltzmann law: the total energy emitted at all wavelengths by a black body is related to the absolute temperature.
wein’s displacement law: objects of different temperature emit spectra that peak at different wavelengths that is inversely proportional to temperature.
key elements of infrared detection system

the key elements of infrared detection system are:

ir transmitter

ir transmitter acts as source for ir radiation. according to plank’s radiation law, every object is a source of ir radiation at temp t above 0 kelvin. in most cases black body radiators, tungsten lamps, silicon carbide, infrared lasers, leds of infrared wavelength are used as sources.

transmission medium

as the name suggests, transmission medium provides passage for the radiation to reach from ir transmitter to ir receiver. vacuum, atmosphere and optical fibers are used as medium.

ir receiver

generally ir receivers are photo diode and photo transistors. they are capable of detecting infrared radiation. hence ir receiver is also called as ir detector. variety of receivers are available based on wavelength, voltage and package.

ir transmitter and receivers are selected with matching parameters. some of deciding specifications of receivers are photosensitivity or responsivity, noise equivalent power and detectivity.